I like Karnarium, but they're far from being your typical "swedeath revival" band. I don't even bother checking out most newer Swedish DM bands anymore.
I'll stick to the Gods (Entombed, Carnage, Grave) and the "kvlt classics" (Gorement, Crypts of Kerberos, Darkified, Crematory).

Not really sure if this is about "new old school" bands from Sweden or just newer death metal from Sweden but here's a whole bunch I would recommend checking out:

Bombs of Hades
Vanhelgd
Miasmal
Verminous(not too new really but the new record will be out soon)
Tormented
Revolting
Funeral
Maim
Morbus Chron
Necrovation
Death Breath
Bastard Priest
Entrails(especially the first demo)
Puteraeon(demos especially)